/**
 * jQuery JSON Plugin
 * version: 2.3 (2011-09-17)
 *
 * This document is licensed as free software under the terms of the
 * MIT License: http://www.opensource.org/licenses/mit-license.php
 *
 * Brantley Harris wrote this plugin. It is based somewhat on the JSON.org
 * website's http://www.json.org/json2.js, which proclaims:
 * "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that
 * I uphold.
 *
 * It is also influenced heavily by MochiKit's serializeJSON, which is
 * copyrighted 2005 by Bob Ippolito.
 */

(function ($) {

    var escapeable = /["\\\x00-\x1f\x7f-\x9f]/g,
        meta = {
            '\b':'\\b',
            '\t':'\\t',
            '\n':'\\n',
            '\f':'\\f',
            '\r':'\\r',
            '"':'\\"',
            '\\':'\\\\'
        };

    /**
     * jQuery.toJSON
     * Converts the given argument into a JSON representation.
     *
     * @param o {Mixed} The json-serializble *thing* to be converted
     *
     * If an object has a toJSON prototype, that will be used to get the representation.
     * Non-integer/string keys are skipped in the object, as are keys that point to a
     * function.
     *
     * [obj to string]
     */
    $.toJSON = typeof JSON === 'object' && JSON.stringify
        ? JSON.stringify
        : function (o) {

        if (o === null) {
            return 'null';
        }

        var type = typeof o;

        if (type === 'undefined') {
            return undefined;
        }
        if (type === 'number' || type === 'boolean') {
            return '' + o;
        }
        if (type === 'string') {
            return $.quoteString(o);
        }
        if (type === 'object') {
            if (typeof o.toJSON === 'function') {
                return $.toJSON(o.toJSON());
            }
            if (o.constructor === Date) {
                var month = o.getUTCMonth() + 1,
                    day = o.getUTCDate(),
                    year = o.getUTCFullYear(),
                    hours = o.getUTCHours(),
                    minutes = o.getUTCMinutes(),
                    seconds = o.getUTCSeconds(),
                    milli = o.getUTCMilliseconds();

                if (month < 10) {
                    month = '0' + month;
                }
                if (day < 10) {
                    day = '0' + day;
                }
                if (hours < 10) {
                    hours = '0' + hours;
                }
                if (minutes < 10) {
                    minutes = '0' + minutes;
                }
                if (seconds < 10) {
                    seconds = '0' + seconds;
                }
                if (milli < 100) {
                    milli = '0' + milli;
                }
                if (milli < 10) {
                    milli = '0' + milli;
                }
                return '"' + year + '-' + month + '-' + day + 'T' +
                    hours + ':' + minutes + ':' + seconds +
                    '.' + milli + 'Z"';
            }
            if (o.constructor === Array) {
                var ret = [];
                for (var i = 0; i < o.length; i++) {
                    ret.push($.toJSON(o[i]) || 'null');
                }
                return '[' + ret.join(',') + ']';
            }
            var name,
                val,
                pairs = [];
            for (var k in o) {
                type = typeof k;
                if (type === 'number') {
                    name = '"' + k + '"';
                } else if (type === 'string') {
                    name = $.quoteString(k);
                } else {
                    // Keys must be numerical or string. Skip others
                    continue;
                }
                type = typeof o[k];

                if (type === 'function' || type === 'undefined') {
                    // Invalid values like these return undefined
                    // from toJSON, however those object members
                    // shouldn't be included in the JSON string at all.
                    continue;
                }
                val = $.toJSON(o[k]);
                pairs.push(name + ':' + val);
            }
            return '{' + pairs.join(',') + '}';
        }
    };

    /**
     * jQuery.evalJSON
     * Evaluates a given piece of json source.
     *
     * @param src {String}
     *
     * [string to obj]
     */
    $.evalJSON = typeof JSON === 'object' && JSON.parse
        ? JSON.parse
        : function (src) {
        return eval('(' + src + ')');
    };

    /**
     * jQuery.secureEvalJSON
     * Evals JSON in a way that is *more* secure.
     *
     * @param src {String}
     */
    $.secureEvalJSON = typeof JSON === 'object' && JSON.parse
        ? JSON.parse
        : function (src) {

        var filtered =
            src
                .replace(/\\["\\\/bfnrtu]/g, '@')
                .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
                .replace(/(?:^|:|,)(?:\s*\[)+/g, '');

        if (/^[\],:{}\s]*$/.test(filtered)) {
            return eval('(' + src + ')');
        } else {
            throw new SyntaxError('Error parsing JSON, source is not valid.');
        }
    };

    /**
     * jQuery.quoteString
     * Returns a string-repr of a string, escaping quotes intelligently.
     * Mostly a support function for toJSON.
     * Examples:
     * >>> jQuery.quoteString('apple')
     * "apple"
     *
     * >>> jQuery.quoteString('"Where are we going?", she asked.')
     * "\"Where are we going?\", she asked."
     */
    $.quoteString = function (string) {
        if (string.match(escapeable)) {
            return '"' + string.replace(escapeable, function (a) {
                var c = meta[a];
                if (typeof c === 'string') {
                    return c;
                }
                c = a.charCodeAt();
                return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
            }) + '"';
        }
        return '"' + string + '"';
    };

})(jQuery);
